1. Habitat Vs. Niche HABITAT: THE ORGANISM’S HOME
Alpine meadows, conifer forests, marshes, lakes, deserts, and zones along stream banks are all different habitats that you may be able to visualize from your own experience.
NICHE: THE ORGANISM’S ROLE
Each organism has to adapt its lifestyle habits (how much water it takes in, what it eats, where it sleeps, when the best time for reproduction is) to the environment it lives in.
Habitat: the organism’s address
Niche: the organism’s lifestyle

2. Species Interactions
Populations do not live in isolation, but interact with each other. They also compete for resources.

3. 1. Competition
Resources such as food, water, space, and light are necessary for life.
Competition between organisms takes place when two or more organisms rely on the same resource(s).
When the resource is plentiful, competition is not as fierce
When the resource is scarce competition increases
a. The strong kill off the weak
b. Animals migrate or starve

4. 2. Predation All living things require energy
Some organisms produce their own food using energy from the sun = Producers
Some organisms acquire energy by consuming other organisms = Consumers
Predation is the act of one organism consuming another organism for food.
Predator = the organism that is looking for food
Prey = the organism that becomes food

5. 3. Symbiotic Relationships
Symbiosis describes the type of relationship that forms when two or more species live together
There are THREE classifications of symbiotic relationships

6. a. Mutualism
Two or more organisms living closely together and mutually benefiting from one another's existence
Fungi and Algae form lichens through a mutualistic relationship. The Fungi provides a habitat for the Algae. The Algae provides
food for the Fungi.

7. Staphylococcus epidermidis, a consistent inhabitant of the skin of humans. The bacterium produces lactic acid that protects the skin from colonization by harmful microbes. But it has been suggested that other by-products are produced by the bacteria are a cause of body odors (good or bad, depending on your personal point of view).

8. b. Commensalism
Commensalism occurs when one organism is benefiting and the other organism, although not benefiting from the relationship, is also not being harmed.
Tree and lichens: The lichen gets better exposure to the sunlight. The tree doesn’t benefit from the relationship but it isn’t harmed either.

9. c. Parasitism
Parasitism occurs when one organism is benefiting at the expense of another organism.
Typically doesn’t kill the “host” because then the parasite would also die.
Ticks, fleas, bacteria, tapeworms, roundworms

10. Athletes foot
Tick

12. Species Interaction Review
Match the symbiotic relationships with the pair of symbols on the left
+, +
+, 0
+, -
Give an example of each
Parasitism
Commensalism
Mutualism

13. Competition Scenario
Deer If you need FOOD = hands over your stomach If you need WATER = hands over your mouth If you need SHELTER = hands over your head Resources If you are FOOD hands over your stomach If you are WATER = hands over your mouth If you are SHELTER = hands over your head Pick a sign and DO NOT CHANGE

14. Turn around and find a match.
Deer
If you do NOT find a match, you DIE and become a resource
If you find a match, you reproduce (the resource that you matched with now becomes a deer)
Resource
If you do NOT find a match you continue to be a resource for the next round.
If you find a match, you now become a deer.